by Capebuild » Tue Jul 20, 2021 10:28 am
Thanks all, again, for the follow up. I keep asking myself why I went ahead and urethaned these surfaces prior to installation... but one of those things, hindsight being 20/20. A lesson learned.
That being said, needless to say I've been pondering this since yesterday. Had a conversation with a Loctite rep this morning. He suggested I look into Loctite adhesive Teroson MS939NA. Supposedly has good bonding capabilities. I just printed out the data sheet...so still researching it. I also asked him how it compared with PL3X Premium. He said they're similar but different animals. So will print out that data sheet and compare. And I'm also doing some testing with scraps. But one thing I've read is to make sure the urethane is really dried (cured). 48 hours was mentioned, but being so humid I think I'll give it longer before bonding the 3 wall layers together. I also think I'll give the urethaned surfaces a light sanding with the orbital sander. If I think of it like using super glue, you have better results if the mating surfaces are smooth. The other thing about doing the orbital sander thing is it kind of gets rid of that initial urethane film on the surface. That is where the failure (delimitation) would occur, acting like a wax paper release; just pulling away from the sealed surface. Also.... one other thing... I'm thinking of drilling a series of small (1/4") holes in mating surfaces on slightly different angles.... so when the adhesive is applied it would fill those holes and act like little anchors for the adhesive. That might be overkill, so still thinking about it. The outer ply will get crown stapled to the middle ply so not too worried about that bond. It's the interior ply that gets bonded to the middle skeletonized sheet. That will not have any staples or other mechanical fastening method, as I don't want to see any fill holes.
Anyway... a real learning experience (aren't they all)..... will report back with results.
John
Last edited by
Capebuild on Tue Jul 20, 2021 10:35 am, edited 1 time in total.
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